2006 3,642 vehicles 2005 7,686 vehicles 2004 8,601 vehicles 2003 12,270 vehicles 2002 15,366 vehicles 2001 14,444 vehicles 2000 14,814 vehicles 1999 20,578 vehicles 1998 20,829 vehicles 1997 22,485 vehicles 1996 16,750 vehicles 1995 13,002 vehicles 1994 11,388 vehicles 1993 8,331 vehicles 1992 5,330 vehicles 1991 2,726 vehicles 1990 440 vehicles